import { spawnSync } from "node:child_process";
import { writeFileSync, unlinkSync } from "node:fs";
import { join } from "node:path";
import { tmpdir } from "node:os";
import { codexSteerTaskForTest } from "./src/code-queue";

type JsonRecord = Record<string, unknown>;

function assertCondition(condition: unknown, message: string, detail: JsonRecord = {}): void {
  if (!condition) throw new Error(`${message}: ${JSON.stringify(detail)}`);
}

function runCli(args: string[], stdin?: string): { status: number | null; stdout: string; stderr: string; json: JsonRecord | null } {
  const result = spawnSync("bun", ["scripts/cli.ts", ...args], {
    cwd: process.cwd(),
    input: stdin,
    encoding: "utf8",
  });
  const stdout = String(result.stdout || "");
  let json: JsonRecord | null = null;
  try {
    json = JSON.parse(stdout) as JsonRecord;
  } catch {
    json = null;
  }
  return {
    status: result.status,
    stdout,
    stderr: String(result.stderr || ""),
    json,
  };
}

function nestedRecord(value: unknown, path: string[]): JsonRecord {
  let current: unknown = value;
  for (const key of path) {
    assertCondition(current !== null && typeof current === "object" && !Array.isArray(current), "expected object while traversing JSON", { path, key, current });
    current = (current as JsonRecord)[key];
  }
  assertCondition(current !== null && typeof current === "object" && !Array.isArray(current), "expected nested object", { path, current });
  return current as JsonRecord;
}

function stringArray(value: unknown): string[] {
  return Array.isArray(value) ? value.map((item) => String(item)) : [];
}

function assertDryRunPrompt(response: JsonRecord, expectedText: string): void {
  assertCondition(response.ok === true, "CLI dry-run should succeed", response);
  const data = nestedRecord(response.data, []);
  assertCondition(data.dryRun === true, "dry-run response should expose dryRun=true", data);
  const request = nestedRecord(response.data, ["request"]);
  assertCondition(request.method === "POST", "dry-run should expose request method", request);
  assertCondition(request.path === "/api/tasks/codex_test_task/steer", "dry-run should expose request path", request);
  assertCondition(request.stableProxyPath === "/api/microservices/code-queue/proxy/api/tasks/codex_test_task/steer", "dry-run should expose stable proxy path", request);
  const prompt = nestedRecord(response.data, ["request", "body", "prompt"]);
  assertCondition(prompt.text === expectedText, "dry-run prompt text mismatch", prompt);
  assertCondition(prompt.chars === expectedText.length, "dry-run prompt char count mismatch", prompt);
  assertCondition(prompt.truncated === false, "dry-run prompt must not truncate", prompt);
  const bodySummary = nestedRecord(response.data, ["request", "bodySummary"]);
  assertCondition(bodySummary.promptChars === expectedText.length, "dry-run should expose body prompt char count", bodySummary);
  const commands = nestedRecord(response.data, ["commands"]);
  assertCondition(String(commands.rawProxy || "").includes("microservice proxy code-queue /api/tasks/codex_test_task/steer --method POST"), "dry-run should expose raw proxy equivalent", commands);
}

function assertReason(result: unknown, reason: string, status: number | null): void {
  const data = nestedRecord({ data: result }, ["data"]);
  assertCondition(data.ok === false, "classified steer failure should be ok=false", data);
  const diagnostics = nestedRecord(data, ["diagnostics"]);
  assertCondition(diagnostics.reason === reason, "unexpected steer failure reason", diagnostics);
  assertCondition(diagnostics.status === status, "unexpected steer failure status", diagnostics);
  assertCondition(typeof diagnostics.retryable === "boolean", "diagnostics should expose retryable boolean", diagnostics);
  assertCondition(Array.isArray(diagnostics.recommendedCrossChecks), "diagnostics should expose cross-check commands", diagnostics);
}

export function runCodeQueueCliSteerContract(): JsonRecord {
  const positional = runCli(["codex", "steer", "codex_test_task", "correct the running task", "--dry-run"]);
  assertDryRunPrompt(positional.json ?? {}, "correct the running task");
  assertCondition(String(positional.json?.command || "").includes("<prompt:redacted>"), "outer command should redact positional steer prompt", positional.json ?? {});
  assertCondition(!String(positional.json?.command || "").includes("correct the running task"), "outer command must not echo positional steer prompt", positional.json ?? {});

  const stdin = runCli(["codex", "steer", "codex_test_task", "--prompt-stdin", "--dry-run"], "stdin steer prompt\n");
  assertDryRunPrompt(stdin.json ?? {}, "stdin steer prompt\n");

  const promptFile = join(tmpdir(), `unidesk-code-queue-steer-${process.pid}.txt`);
  writeFileSync(promptFile, "file steer prompt", "utf8");
  try {
    const fromFile = runCli(["codex", "steer", "codex_test_task", "--prompt-file", promptFile, "--dry-run"]);
    assertDryRunPrompt(fromFile.json ?? {}, "file steer prompt");
  } finally {
    unlinkSync(promptFile);
  }

  const duplicateSource = runCli(["codex", "steer", "codex_test_task", "positional", "--prompt-stdin", "--dry-run"], "stdin\n");
  assertCondition(duplicateSource.status !== 0, "duplicate prompt source should fail", duplicateSource.json ?? { stdout: duplicateSource.stdout });
  const duplicateMessage = String(nestedRecord(duplicateSource.json, ["error"]).message || "");
  assertCondition(duplicateMessage.includes("exactly one prompt source"), "duplicate prompt source error should be explicit", { duplicateMessage });

  const unknownOption = runCli(["codex", "steer", "codex_test_task", "--queue", "default", "prompt", "--dry-run"]);
  assertCondition(unknownOption.status !== 0, "unknown steer option should fail", unknownOption.json ?? { stdout: unknownOption.stdout });
  const unknownMessage = String(nestedRecord(unknownOption.json, ["error"]).message || "");
  assertCondition(unknownMessage.includes("unsupported codex steer option: --queue"), "unknown option error should name option", { unknownMessage });

  const help = runCli(["codex", "help"]);
  assertCondition(help.status === 0 && help.json?.ok === true, "codex help should succeed", help.json ?? { stdout: help.stdout });
  const usage = stringArray(nestedRecord(help.json?.data, []).usage);
  assertCondition(usage.some((line) => line.includes("codex steer <taskId>")), "codex help should list steer", { usage });

  let dryRunFetchCount = 0;
  const dryRunDirect = codexSteerTaskForTest("direct_task", ["do not send", "--dry-run"], () => {
    dryRunFetchCount += 1;
    return { ok: true, status: 200, body: { ok: true } };
  });
  assertCondition(dryRunFetchCount === 0, "dry-run must not call stable proxy helper", { dryRunFetchCount, dryRunDirect });

  const longPrompt = `${"x".repeat(480)}-tail-secret-marker`;
  const longDryRun = codexSteerTaskForTest("direct_task", [longPrompt, "--dry-run"], () => {
    throw new Error("dry-run should not fetch");
  }) as JsonRecord;
  const longPreview = nestedRecord(longDryRun, ["request", "body", "prompt"]);
  assertCondition(longPreview.truncated === true, "long dry-run prompt should be truncated", longPreview);
  assertCondition(!String(longPreview.text || "").includes("tail-secret-marker"), "long dry-run must not leak prompt tail", longPreview);

  let fetchPath = "";
  let fetchMethod = "";
  let fetchPrompt = "";
  const success = codexSteerTaskForTest("direct_task", ["send this"], (path, init) => {
    fetchPath = path;
    fetchMethod = String(init?.method || "");
    fetchPrompt = String((init?.body as JsonRecord | undefined)?.prompt || "");
    return {
      ok: true,
      status: 200,
      body: {
        ok: true,
        task: { id: "direct_task", status: "running", prompt: "p" },
        queue: { activeTaskIds: ["direct_task"] },
      },
    };
  }) as JsonRecord;
  assertCondition(fetchPath === "/api/microservices/code-queue/proxy/api/tasks/direct_task/steer", "non-dry-run should use stable proxy path", { fetchPath });
  assertCondition(fetchMethod === "POST", "non-dry-run should POST", { fetchMethod });
  assertCondition(fetchPrompt === "send this", "non-dry-run should send raw prompt in body", { fetchPrompt });
  assertCondition(nestedRecord(success, ["steer"]).accepted === true, "successful steer should report accepted=true", success);
  const successJson = JSON.stringify(success);
  assertCondition(nestedRecord(success, ["steer"]).promptOmitted === true, "successful steer should mark prompt omitted", success);
  assertCondition(!successJson.includes("send this"), "successful steer must not echo prompt text", success);
  assertCondition(!successJson.includes("promptPreview"), "successful steer must not include promptPreview", success);

  assertReason(codexSteerTaskForTest("direct_task", ["p"], () => ({ ok: false, exitCode: 1, stderrTail: "Cannot connect to the Docker daemon" })), "backend-core-unreachable", null);
  assertReason(codexSteerTaskForTest("direct_task", ["p"], () => ({ ok: false, status: 404, body: { ok: false, error: "microservice not found: code-queue" } })), "code-queue-microservice-unregistered", 404);
  assertReason(codexSteerTaskForTest("direct_task", ["p"], () => ({ ok: false, status: 401, body: { ok: false, error: "unauthorized" } })), "proxy-unauthorized", 401);
  assertReason(codexSteerTaskForTest("direct_task", ["p"], () => ({ ok: false, status: 404, body: { ok: false, error: "proxy route not found", path: "/api/microservices/code-queue/proxy/api/tasks/direct_task/steer" } })), "proxy-404", 404);
  assertReason(codexSteerTaskForTest("direct_task", ["p"], () => ({ ok: false, status: 404, body: { ok: false, error: "task not found" } })), "steer-endpoint-404", 404);
  assertReason(codexSteerTaskForTest("direct_task", ["p"], () => ({ ok: false, status: 409, body: { ok: false, error: "task does not have an active steerable turn" } })), "upstream-runtime-rejected", 409);
  assertReason(codexSteerTaskForTest("direct_task", ["p"], () => ({ ok: false, status: 504, body: { ok: false, error: "provider HTTP tunnel timed out or disconnected", stage: "http-tunnel-wait" } })), "stable-proxy-failed", 504);

  return {
    ok: true,
    checks: [
      "steer positional dry-run",
      "steer stdin dry-run",
      "steer prompt-file dry-run",
      "duplicate prompt source failure",
      "unsupported option failure",
      "codex help lists steer",
      "outer command redacts positional steer prompt",
      "dry-run does not call stable proxy helper",
      "dry-run prompt preview is bounded",
      "non-dry-run uses stable proxy helper",
      "successful steer confirms write without echoing prompt",
      "steer failure classification is JSON-consumable",
    ],
  };
}

if (import.meta.main) {
  const result = runCodeQueueCliSteerContract();
  process.stdout.write(`${JSON.stringify(result, null, 2)}\n`);
}